HARRISBURG, Pa. (CBS) — Governor Tom Corbett was thanking Pennsylvanians today for staying off the roads, and he was encouraging people who don’t need to travel to remain indoors.

At a late-morning briefing, Corbett said nearly 2,000 Pennsylvania Department of Transportation and PennsylvaniaTurnpike Commission trucks were plowing roads.

In addition, he said, “We’ve called up 783 members of the National Guard to support this operation. The Guard has deployed liaison officers to Chester, Delaware, Lehigh, Northampton and Philadelphia counties so far.”

The governor also says the Pennsylvania National Guard has 14 four-wheel-drive ambulances available to support civilian EMTs in areas of the state hardest hit by the storm.

He reminded residents who lose power not to use alternative methods to heat their homes, to avoid carbon monoxide poisoning.

Corbett says the emergency declaration issued after last week’s storm (see related story) is still in effect.